On the contrary, the operation difficulty is small.
反之操作难度就小一些。
Further the operation can be simplified, operation difficulty is reduced, operation time is shortened and the curative effect of the operation is raised.
本实用新型根据手术的需要设计特殊的器械，具有实用方便的特点，简化手术操作，降低手术难度，缩短手术时间，提高手术的疗效。
Result:In interventional group improved posture hadn't increase operation difficulty or enlongate duration, but reduce time duration of cervical hyper extension.
结果：干预组并不增加手术难度及手术时间，但可显著缩短术中头颈部过伸位的时间；
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